Troubleshooting; Specifications - Boss Audio Systems MR250.4 User Manual

Troubleshooting
If you experience operation or perionnance problems with this product, compare your
installation with the electrical wiring diagram on the previous pages. If problems persist,
read the following troubleshooting tips which may help eliminate the problems.
SYMPTOM POSSIBLE REMEDY
Amplifier will not
power up.
Check to make sure you have
a
good ground connection.
Check that the Remote Input (Tum-On) has at least 3VDC.
Check that there Is battery power on the (+) terminal.
Check that there Is at
least
12v.
Check all fuses, replace
If
necessary.
Make sure that the Protection LED ls not illuminated.
If
It Is lit. shut off
the amplifier briefly. and (hen repower It.
Protection LE.D
comes on when
amplifier is
powered up.
Check for short clrcwts on speaker leads.
Tum down the volume control on the head umt to prevent overdrlving.
Remote speaker leads, and reset the amplifier. If the Protection LED stil,
comes on, then the ampllfTer Is faulty and needs servicing,
No output. Check that all fuses are OK.
Check that amplifier
Is
properly grounded.
Check thaI the Remote Input (Tum· On) has at least 3VDC.
Check that the RCA audio cables are plugged into the proper Inputs.
Check all speaker wiring,
Low output.
Reset the Level Control.
Check the Crossover Control settings.
Audio present in
only one channel.
Check the RCA Interconnect cables.
Check all speaker Wiring.
High hiss in the
speakers.
Disconnect all RCA Inputs to the amplifiers, It the hiss disappears, thel
plug in the component dn"vmg the amplifier and unplug Its Inputs.
If thE
hiss
disappears
a/
this point.
go
on until the faulty/noisy component
is
found.
It
IS
best to set the amplifier's Input level control as low as possible. Th
best
sUbjective s/gna/-to-noise ratio is achieved In this manner. Try
/0 s
the head unit
as
high
8S
possible (I¥/lhout distortion) and the amp Inpu
level as low
as
possIble.
Squealing noise
from speakers.
Check for improperly grounded RCA Interconnects,
Distorted sound. Check that the Input Level Contrails set to match the signal level of the
head unit. Always try to set the Input Lavel
as
low as possIble.
Clleck that all crossover frequencies are properly set.
Check for short circuits on the speaker leads.
Amplifier gets
very hot.
CllfICk that the minimum speaker Impedance tor the amp model Is correct.
Check thaI there is good air circulatJon around the amp. In some
applications, it may be necessary to add and extemal cooling fan.
Engine noise
(static type)
This
is usually
caused
by poor quality RCA cables. which can pick up
radiated nOise. Use only the best quality cables. and route them away
from power cables
Engine noise
(alternator
whine)
Check that speaker leads are not shorted to the man'ne vessel chassis.
Check that the RCA grounds
are
not shorted to the marine vessel
chassis.
Check that the head unit
is
properly grounded.
Specifications
MODEL
I\M$ POWER
into 4 Ohm5
'MAX POWER
into 2 Ohms
BRIOGE.O POWER
Into 4 Ohms
Min. speak·e.
,impedance
THO
Frequency response
Sl~na!·to-noi$e
r... tio
Channel separation
Damping factor
Crossover range
low pa••
[high pass
[Bass Ibo'ost
IFuse
rating
i{;lil1lenslorfS:
(1, 1·3/4" X 2-518;1 l< ... )
Two Chllnnel
Four Chenn'1l
MarIne
Amplifier
Marine
AmplifIer
MR400.2
MR.250.
125W x2
100Wx4
400W x 2
250W
x 4
SOOW
x
1
500W x2
2 Ohm Stereo/4 Ohm Mono Bridged - - - - - ­
0.01%
6Hz-50kHz
103dB
90dS
125+
35HZ-155Hz
200Hz (fixed)
0- +1SdS
25A
x
10-31S'
0.01%
6Hz-50kHz
103dB
gOdS
125+
35Hz.-155Hz
200Hz (fixed)
o
-+18dS
15Ax2
13-1116'
All specifications subject to
change without notice.
e
t
Maline MOSFET Amplifier U..,,'. Manual - p3ge 14
Marine MOSFET Amplifier User'. Manual· page 15